A case study of rail corrugation phenomenon based on the viewpoint of friction-induced oscillation of a wheelset-track system
A case study of rail corrugation phenomenon based on the viewpoint of friction-induced oscillation of a wheelset-track system
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基于轮对-轨道系统摩擦振动视角的钢轨波磨现象案例研究
DOI：
10.21595/jve.2017.17867
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发表时间：
2017-09
影响因子：
1
通讯作者：
Yan Wenyi
中科院分区：
文献类型：
--
作者：
Cui Xiaolu;Chen Guangxiong;Yang Hongjuan;Ouyang Huajiang;Yan Wenyi
在北京地铁中发现了一种在公开文献中未见报道的有趣的钢轨弯曲现象，即尽管科隆蛋枕区段和固定双短枕区段位于同一大曲率轨道上，但两种区段的钢轨弯曲波长明显不同。基于摩擦振动是引起钢轨振动的主要原因这一观点，建立了同一曲线轨道上过渡段的3种多轮对-轨道模型。采用复特征值法结合瞬态动力学方法对这一现象进行了研究。仿真结果与真实的地铁实测结果基本一致。结果表明，不稳定振动主要发生在低轨上，不同轨枕支承段的不稳定振动频率有明显差异。固定双短睡眠者和科隆蛋睡眠者部分的主要不稳定振荡频率分别约为201和422 Hz。然而，当急曲线轨道仅由固定双短枕或科隆蛋枕支撑时，不稳定振荡频率彼此接近，均为420 Hz左右。因此，在不同的条件下，对应的轨道反射波长是不同的。这一局部特殊现象得到了满意的解释，进一步证实了摩擦诱发振动的观点。
An interesting rail corrugation phenomenon unreported in open literature is found in Beijing metros, in which the wavelength of rail corrugation in the Cologne egg sleeper section is obviously different from that in the fixed dual short sleeper section, although both sleeper sections are located on an identical sharp curved track. Based on the viewpoint that friction-induced oscillation is the main cause of rail corrugation in some cases, three multiple-wheelset-track models in the transitional section on an identical sharp curved track are built in this paper. The phenomenon is researched by adopting the complex eigenvalue method together with the transient dynamic method. The simulation results are consistent with the corrugation measured in real metros. It can be found that the unstable oscillations mainly occur on the low rail and the relevant frequencies are noticeably different in different sleeper support sections. The dominant unstable oscillation frequencies in the fixed dual short sleeper and Cologne egg sleeper sections are about 201 and 422 Hz, respectively. However, when a sharp curved track is supported only by fixed dual short sleepers or Cologne egg sleepers, the unstable oscillation frequencies are close to each other, which are both about 420 Hz. Therefore, the corresponding wavelengths of rail corrugation are different in different conditions. The local special phenomenon can be satisfactorily explained and the viewpoint of friction-induced oscillation can be further verified.
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